...and they kinda move and are more and less visible depending on what is being rendered.

It's much harder to see in the second image... The same thing happens with UT2003, and all other 3D games as well. Anything beyond the 4463 series, and you get this... So I've stuck with the 4463 for some time...

This is going to be a hard one when I try to upgrade to the 2.6 kernel! I've tried to see if using the Debian kernel modules (in apt) but as they're still based on the 4496, things don't work!